How can Zhuge Liang know everything about the weather? Is it really unpredictable?

Zhuge Liang understood that the weather was only the law he summed up at that time, not the theory of ghosts and gods.

This day in Battle of Red Cliffs is called the winter solstice. The days are short and the nights are long. Everyone knows that the northwest wind blows in winter, and Cao Cao believed it at that time. Zhuge Liang, on the other hand, made full preparations. After his own thinking and asking the local people, he came to the conclusion that there is a high probability of a southeast wind during the winter solstice, and he can only pray for a southeast wind. So he told Zhou Yu that he was going to borrow Dongfeng. As soon as the east wind arrives, he only needs to light the warship, which is bound to give Wei Jun a heavy blow.

By this time, Sun and Liu Lianjun were already waiting. In fact, Zhuge Liang did not expect it. Fortunately, the east wind came later. They lit warships, and the wind attacked Wei Jun with the burning warships. Cao Cao's troops were unprepared and suffered heavy losses. Later, Cao Cao found himself losing the game and ran away in a hurry. This battle is called "Battle of Red Cliffs".

Zhuge Liang's "borrowing from the east wind" is still due to his good observation of life and his understanding of thinking, knowing that the wind direction may change on the day of winter solstice. But Cao Cao didn't think of this. Cao Cao is too confident. Zhuge Liang's move can be said to have won great face for Shu Han who was originally in a weak position.

In fact, Zhuge Liang still has plans to succeed in his studies. He won't stand in his way. He told Lu Su to train the soldiers well and arrange troops as soon as possible. The calculation is that if he can't borrow the east wind here, they can substitute in time and not be caught off guard. This shows that Zhuge Liang is a thoughtful man. Battle of Red Cliffs laid the foundation for the tripartite confrontation among the three countries.